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Marine Acid Wash



Read the product SDS carefully before handling this product. 

Fibreglass renewal: 1 part to up to 6 parts water. 
- Removal of slime and renewal of anti-fouling: 1 part to 10 parts water. 

Renewal of fibreglass 

  1. Remove any loose contamination. 
  2. Broom onto the hull or deck. 
  3. Allow to dwell for 2 to 3 minutes, but do not allow to dry. 
  4. Thoroughly rinse the area with water. Preferably use a pressure washer. 
  5. For stubborn rust staining around metal fittings, detail with an abrasive pad. 

Removal of slime and anti-fouling 

  1. Broom onto the hull. 
  2. Allow to dwell for 2 to 3 minutes. 
  3. Thoroughly rinse the area with water. Preferably use a pressure washer. 
  4. Re-apply, once slime and other contaminants are removed, to etch the surface prior to applying anti-fouling. 

- Avoid contact with stainless steel, aluminium, polished chrome and painted surfaces.
- See Related Products tab.

Cyndan Marine Acid Wash is an advanced multi-function marine cleaning formulation; highly effective for removing slime, cleaning fibreglass hulls and for preparing surfaces for anti-fouling treatment. This inclusion of phosphorylated ethoxylate means Marine Acid Wash delivers a superior result at lower acid levels than other popular marine cleaners.

For larger quantities, please contact our office.

More details

Cyndan Marine Acid Wash is an enhanced formula with Phosphorylated Ethoxylate. This formulation offers superior cleaning with less acid.

Triple Action

ACTION 1: Excellent for renewal of fibreglass which is faded or stained from rust, exhaust fumes, environmental contamination etc.

ACTION 2: Ideal for removal of slime from hulls, anti-fouling and running gear.

ACTION 3: When used on anti-fouling, Marine Acid Wash etches the previous anti-fouling to provide a surface which binds to the new anti-fouling thus ensuring a better adhesion and longer life.

For action 1: Dilute Marine Acid Wash with up to 6 parts of water. Broom on to the hulls or decks. Allow to react for 2-3 minutes and rinse with high-pressure water. For stubborn rust staining around metal fittings, detailing with a non-scratching abrasive pad may be necessary.

For actions 2-3: Apply at a diluted rate of 1 part Marine Acid Wash with ten parts of water. Broom on, allow 2-3 minutes reaction time and rinse with high-pressure water. A reapplication after all slime and foreign matter is removed is recommended to etch the surface prior to applying anti-fouling.

Finish off with Stainless Steel Sentry

Marine Acid Wash is a perfect companion product of Cyndan’s Stainless Steel Sentry.

Stainless Steel Sentry will provide a long term protection to all marine grade stainless steel, protecting it from unsightly tea staining and rust.


  • Advanced triple-action formulation
  • Antifouling cleaning & etching solution
  • Effective fibreglass boat cleaner
  • Contains phosphorylated ethoxylate for better results with less acid

Ideal for:

  • Boat hull cleaning
  • Faded or rust-stained fibreglass
  • Slime removal
  • Anti-fouling
  • Safety Data Sheet: Refer to the SDS before handling this product.
  • Storage: Store in the closed, original container in a cool, dry and well-ventilated place out of reach of children. | Do not store in direct sunlight.
  • Disposal: Containers must be thoroughly rinsed and dried before disposal. | Dispose of in accordance with your local government regulations - if in doubt return empty container to the manufacture. | Empty containers and product should not be burnt.
  • Safe Use - RED Code - Dangerous Goods: Only those personnel trained in the handling and storage of chemicals should use these products as they require the use of protective/safety gear when used and must be stored according to the manufacturer’s directions for safe storage.
  • Personal Protection Equipment (PPE): See 'Related Products' on this page.
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